[PATCH 6/29] x86-apic-virtwire-on-shutdown
From: Eric W. Biederman
Date: Wed Jan 19 2005 - 02:36:18 EST
When coming out of apic mode attempt to set the appropriate
apic back into virtual wire mode. This improves on previous versions
of this patch by by never setting bot the local apic and the ioapic
into veritual wire mode.
This code looks at data from the mptable to see if an ioapic has
an ExtInt input to make this decision. A future improvement
is to figure out which apic or ioapic was in virtual wire mode
at boot time and to remember it. That is potentially a more accurate
method, of selecting which apic to place in virutal wire mode.
Signed-off-by: Eric Biederman <ebiederm@xxxxxxxxxxxx>
---
arch/i386/kernel/apic.c | 38 +++++++++++++++++++++++++++++++++++++-
arch/i386/kernel/io_apic.c | 33 ++++++++++++++++++++++++++++++++-
include/asm-i386/apic.h | 2 +-
include/asm-i386/apicdef.h | 1 +
4 files changed, 71 insertions(+), 3 deletions(-)
diff -uNr linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/arch/i386/kernel/apic.c linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/arch/i386/kernel/apic.c
--- linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/arch/i386/kernel/apic.c Tue Jan 18 22:43:54 2005
+++ linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/arch/i386/kernel/apic.c Tue Jan 18 22:45:00 2005
@@ -211,7 +211,7 @@
enable_apic_mode();
}
-void disconnect_bsp_APIC(void)
+void disconnect_bsp_APIC(int virt_wire_setup)
{
if (pic_mode) {
/*
@@ -224,6 +224,42 @@
"entering PIC mode.\n");
outb(0x70, 0x22);
outb(0x00, 0x23);
+ }
+ else {
+ /* Go back to Virtual Wire compatibility mode */
+ unsigned long value;
+
+ /* For the spurious interrupt use vector F, and enable it */
+ value = apic_read(APIC_SPIV);
+ value &= ~APIC_VECTOR_MASK;
+ value |= APIC_SPIV_APIC_ENABLED;
+ value |= 0xf;
+ apic_write_around(APIC_SPIV, value);
+
+ if (!virt_wire_setup) {
+ /* For LVT0 make it edge triggered, active high, external and enabled */
+ value = apic_read(APIC_LVT0);
+ value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED );
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXTINT);
+ apic_write_around(APIC_LVT0, value);
+ }
+ else {
+ /* Disable LVT0 */
+ apic_write_around(APIC_LVT0, APIC_LVT_MASKED);
+ }
+
+ /* For LVT1 make it edge triggered, active high, nmi and enabled */
+ value = apic_read(APIC_LVT1);
+ value &= ~(
+ APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
+ apic_write_around(APIC_LVT1, value);
}
}
diff -uNr linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/arch/i386/kernel/io_apic.c linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/arch/i386/kernel/io_apic.c
--- linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/arch/i386/kernel/io_apic.c Fri Jan 14 04:32:22 2005
+++ linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/arch/i386/kernel/io_apic.c Tue Jan 18 22:45:00 2005
@@ -1631,12 +1631,43 @@
*/
void disable_IO_APIC(void)
{
+ int pin;
/*
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
- disconnect_bsp_APIC();
+ /*
+ * If the i82559 is routed through an IOAPIC
+ * Put that IOAPIC in virtual wire mode
+ * so legacy interrups can be delivered.
+ */
+ pin = find_isa_irq_pin(0, mp_ExtINT);
+ if (pin != -1) {
+ struct IO_APIC_route_entry entry;
+ unsigned long flags;
+
+ memset(&entry, 0, sizeof(entry));
+ entry.mask = 0; /* Enabled */
+ entry.trigger = 0; /* Edge */
+ entry.irr = 0;
+ entry.polarity = 0; /* High */
+ entry.delivery_status = 0;
+ entry.dest_mode = 0; /* Physical */
+ entry.delivery_mode = 7; /* ExtInt */
+ entry.vector = 0;
+ entry.dest.physical.physical_dest = 0;
+
+
+ /*
+ * Add it to the IO-APIC irq-routing table:
+ */
+ spin_lock_irqsave(&ioapic_lock, flags);
+ io_apic_write(0, 0x11+2*pin, *(((int *)&entry)+1));
+ io_apic_write(0, 0x10+2*pin, *(((int *)&entry)+0));
+ spin_unlock_irqrestore(&ioapic_lock, flags);
+ }
+ disconnect_bsp_APIC(pin != -1);
}
/*
diff -uNr linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/include/asm-i386/apic.h linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/include/asm-i386/apic.h
--- linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/include/asm-i386/apic.h Tue Jan 18 22:43:55 2005
+++ linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/include/asm-i386/apic.h Tue Jan 18 22:45:00 2005
@@ -100,7 +100,7 @@
extern int get_maxlvt(void);
extern void clear_local_APIC(void);
extern void connect_bsp_APIC (void);
-extern void disconnect_bsp_APIC (void);
+extern void disconnect_bsp_APIC (int virt_wire_setup);
extern void disable_local_APIC (void);
extern void lapic_shutdown (void);
extern int verify_local_APIC (void);
diff -uNr linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/include/asm-i386/apicdef.h linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/include/asm-i386/apicdef.h
--- linux-2.6.11-rc1-mm1-nokexec-x86_64-i8259-shutdown/include/asm-i386/apicdef.h Tue Jan 18 22:43:44 2005
+++ linux-2.6.11-rc1-mm1-nokexec-x86-apic-virtwire-on-shutdown/include/asm-i386/apicdef.h Tue Jan 18 22:45:00 2005
@@ -86,6 +86,7 @@
#define APIC_LVT_REMOTE_IRR (1<<14)
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
+#define APIC_MODE_MASK 0x700
#define GET_APIC_DELIVERY_MODE(x) (((x)>>8)&0x7)
#define SET_APIC_DELIVERY_MODE(x,y) (((x)&~0x700)|((y)<<8))
#define APIC_MODE_FIXED 0x0
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/